The Effect of Cooling Rate on the Eutectoid Reaction of High Silicon Steels

• Main Authors: Chang-Yi Lin, 林瑺毅
• Other Authors: Tien-Shou Lei
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/17643204093531209334

碩士 === 國立臺灣科技大學 === 機械工程系 === 90 === This research has aimed to investigate the effect of cooling rate on the eutectoid reaction of high silicon steels. A self designed vacuum heat treating system controlled by personal computer was used to measure the electrical resistivity of high silicon steels during the heat treating in a real-time situation . The characteristic of phase transformation of eutectoid reaction of three high silicon steels with different silicon and carbon contents were studied with different cooling rate, also the hardness test and optical metallographic examination were used to study the microstructures. The experimental results show that: (1) the hardness of high silicon steels after eutectoid reaction was higher for faster cooling rate and lower silicon content; (2) the temperature range of phase transformation and the relative ferrite fraction were affected by silicon content, and both were larger for a higher silicon content; (3) the growth of ferrite was closely related to the cooling rate, a thinner ferrite grain with a faster cooling rate, and a cooling rate of 2℃/s was a critical one for the growth of ferrite.